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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc3d34f5bcc1f64a35ba194a0e8f5513e4bcaf7471516527f5ff0924c91ab17' 
  AND token = 'iHulFDbnU85xuA78XeGksmgnkmVvZ2q7weGejbLzZ7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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