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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede1cb119e764244ff644c58022373f34871d96fb8b4994385a9ac6989da48c1' 
  AND token = 'zCuK7zegqCNsUZv6tu6LxYipoeX8deWfufcOvZo/WO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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