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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35960b0a58a518ea702e02b70b6e5f2083d821ad6aed3c62e5ed33239b2f6df4' 
  AND token = 'lZwHkfRfQFpGKyOuLb2mJSql9zHAnPy9T+54GjdaS24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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