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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d7fbba39a4a75b79d1fc05762afa2094ec86951a2225009b38e7463b338e61' 
  AND token = 'hsHQ3lCc3sK1/vv65Nj7BUSIm5OWcp20j+7tvtIkCnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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