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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dddc6188db5a2ea68a2cfc41d25d70749a56f5479fd9e4a823a8e0a8a44a1f3f' 
  AND token = 'YXoXYgM7+ldj8StWtOScZ77fbtx+xy084gbDoqSjsY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}