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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b68e091f8a803775d84e712856c53644b0f882124b675743dd8b3208610b7f' 
  AND token = 'cKXHeOvzW2ywYjFOaOE3Oql7CHW7asKLDUbPucHj1C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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