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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea25f5a7ef79b51fab2e6801b20b9678f4b540d9d7a6db857952e21b1c4079c2' 
  AND token = 'kpHT8YaT6IlO+JNRH8ftAGCVl4YZCZv4eAf4Ydlh5tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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