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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdf395b2fffd330e05610d660084320f5c5c4dfed8312eb519538c6508c7909' 
  AND token = 'HIqfhfNjPUr8NeVC6wMVdRQvnsuFHdJuLmS+0/BwnaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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