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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f69f631f22f93d7d786de4c51ccd18135331d1053623c2b9d9defba3127cf2' 
  AND token = 'dUeg5HQgO3vMNyRIpfy+74w8yfbicWLtHgJ6g10p/jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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