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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3e9f175ea2befd9446c1880bdd7b16577abf70ed39a9c67a07909647bf14fd' 
  AND token = 'feq/Wpua7IeEhPeu2/J5c2CGXQngarga/lqEMjXZ9K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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