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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf8f52384a051c59f13b237c84253d1bf8dd6045fea58a4b1cad992e46274d8' 
  AND token = '+r0f/DefGPlLFHGddkPbv+PsaiIkR6+TdJpzIWtFf00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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