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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318e92908899b2f0c95db475a6e1332c3036bac950cf207d78d2a0c59553d240' 
  AND token = 'L1SHGdToH7Zj5JAu2sN1smt+zFnpdWOErieJdZVrFzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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