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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d5bab612675f16f745a5d91f3cc8880b1463287e6eebf1d2fa641080e5e40d' 
  AND token = 'XrDv+9FZ6J8ZQIJf3xpkEGRfV3VtoV6Uz4R5y1XvawE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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