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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6859a6800bb193b19f2092d763f3de2a01fc2f12d39ea26061a0704c7e7a0d' 
  AND token = 'eKxwo+ml6lwPb9zd47cdkdGpUYU/Iykumljag1obnMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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