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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d9d7397657f04082d65e8b54d71c6a181f3f48b96cfd04d83951fce8b2c16d' 
  AND token = 'nvtRsuPRIgC2Z/93n5YLcEOzgi0XenV/6niY5vVPHh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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