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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b73f7431befd243668568b42d1a5ee6b9477d13fa50f05e06d302bb6bcab4b' 
  AND token = '7oANU73lci6vDa1qUMkyekwtb6IziCoUwQo+xqpSWcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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