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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5a1245ed974b8caa5b6044c4839b4321096033421e9414759c5811aec53a8a' 
  AND token = 'lkIpDI9ojQA7YdrTGLZN1qRnm/Mw65JcUmMfGMGuN6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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