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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19635b3431ac7a7fbd2e3ba9e1c249a456c4c576952248888dba2fbbe9acb57b' 
  AND token = 'Gm4pZBta0a6404sJwDDCTcJOMvRhHrsU8sDI/6iDe2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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