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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6ac3bb05d97b638e2fa337382cc6911bd14fad734f96a14fcd5ae95f72b09b' 
  AND token = 'RmTEhTctwiSm3Rut+f6yrruWa1KHvBiNxCCDKTjFRUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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