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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7c4695e96ab79e8886cc6f7065876999e9dbd00434e6f0d98aec51f5601fd1' 
  AND token = 'CN6t+/T/buUZ+dcArFMTzTW0d6oXG96YzuvpFJ9y1YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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