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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e84e0f8501aae00bb59fd4473b1d8c49137731a35de94a1d497d670e03bf3e' 
  AND token = 'KZlbH5QFgmO35XXETvX6H7tsirlUr6mvWbnM+pEg3/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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