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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dac6bc2987cfde5e33a16075769e07042729b6bbdc95558da3063f04f22dda' 
  AND token = '6em65QgkDLhh/64pai9DOiv8aw0kT3hpNWuE1lBqhf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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