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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deaf774c105e77ccf50097d3f25d227f9eab32c52c7fb3bdd2cec3e96d975fd7' 
  AND token = 'fH5bYvrPTaX53FE/GxW+NPZpZ3EzM9FfkvZ6Bbchu/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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