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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6d623ef01e6fdcb22c2278d74f669dab6889c4f1b94403cdcfae96c56d177f' 
  AND token = 'DOFnRSboYW7UpXk0Q9ZVIocJwzhUlHZniDiTUAzF05w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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