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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf19cff97c91f0356c0ecb51e72d298ca8d6bc9fb6a4e8f1e5e76e0da85e98f' 
  AND token = '0UeE2Nd5crVeIADmp66ZdD4pnGUaJz2z3SE/FJuqsek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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