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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9f874b0851a8d01e52764daa019fd39fdcebede1c5ed3b04a4177d2bc3f7ba' 
  AND token = 'tKE3FhXzheK5UvzvSW6tp0/g88OwA5ZygixtGlDgl8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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