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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097fa94a2f85f5df259469a308067963f66a872d1103ec4ec03fef2c106b166e' 
  AND token = 'yMRj7rXdVcprxzUc9yOGRgMWn4z0Zz7MbaDq2ou8+hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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