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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce683d97cf45ee9f6b040184db6d186418f0c8e47c579b327ae3a8e03c6d2bd5' 
  AND token = 'ZEcju3kOqbe6iMzep4Ozws/Lszzj5hZZlKXenp4nCzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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