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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf1202ea326feabc7dff99406a5efee974d2998d8fe2b8da35e03ac1394eb60' 
  AND token = 'pZRx4+55CQL8qHsWSG3qzvAufA6IYK3efQGiag6jcx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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