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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376fc59d884e7e5ade4e453bb9e49a0182e3645c15fdfb11b0ad04ad029ccdb8' 
  AND token = 'JwYRLWgHHi2yiJ/Qqt9F2McNdMSnLteS9dYwr4nVzfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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