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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856053b10d8da18f5eb0f4c4e93458d77bfacf0404ceb79696b118e9f7a13089' 
  AND token = 'AGR2Aro9yJ8wRMTmNwgD4Ok5IdcPi/ASKeGTJ93aasA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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