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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02318df74b42d42f5063830a59d9771b472cb8e1614fe4b74400b73717283ac8' 
  AND token = 'Jmn8X/Ot3sEdDgB9GKdET45sRQZJIq2Yy4aqm69zTIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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