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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41777b0d01ebd0135889672e709e0fba90d824c6c17ee571cac91b0109a75ef9' 
  AND token = 'eQMy71KfvDWwHy2xc4IA4s/Qf9tZI8EHHkKkunmmCnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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