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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10340972919af9c00f5e6f21e69cab78e872869a004f597036d5965955e1864e' 
  AND token = 'C9sjjOgLRVVZjD4TCjT781seKxfEw76+D7r2Ylzzsl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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