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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb6e507b787ae3a5643df04ab0d7a1e610567685260b60319caf78b7c78773f' 
  AND token = 'tv8+l5O73a+NleAmAiFIAACxzDPVhY4XsT1ZId/gnoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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