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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d5415fc31c82f1280a0d9d06dc225f3941e9c8be360f2f8133668e388b516c' 
  AND token = '8E+vZfYBceoFXIGoFBYzvM5Tn1pvWpw0evIqX749aXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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