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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee00bdf13e1a0f779b59161cdf7538acdc83f17cd069551038cab2b5fe403ca' 
  AND token = 'LLq9VMSlqr23AG5lHTec0ltaez7ynuRGhvfdncBT8eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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