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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5c8ce2b88a61ae027f7d286a92ed4061a30d6235d036c54f8f608b906f44bd' 
  AND token = '+cTJ+BzKFEqrR7J7w+M4mlUYwMtA4nODllEoLCd7sZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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