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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acb80215f28788152f3dde6659ab822986d58274ec54278ee08c8c3736f718e' 
  AND token = 'N+h2juw1A33qd72vMLXU4SNNY9KImIr9+lM7DjetInw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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