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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d4fab252240d55b28020a743699b2631345848c0b9f55c3f2a5237e2493be0' 
  AND token = 'Y+HbSGaQAP4ss/29ZAvCYiPlYJUPadl/kLjit3GaLZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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