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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887f57347b2a4a6e75a9c5aae5d50557b18399f09ee7fc3cc3b6a2993b94b2ef' 
  AND token = 'KRb20zSF36JJ+qce3PYGQB76M0EmMxJ8+H47PZHwOFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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