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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7039ab666b64c9b5a03c4d4799c1efb6aaf6233f50f22661b331dcdb10c836e8' 
  AND token = '/UA9ZhhXschpsT3G2pt3V/CFp2qmLv2c1LHGZ65FjX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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