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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7d4f4dc5dd0dfe2668a8dba8c08252372513cad9c9f503fd893d25abcb06db' 
  AND token = 'qaR2n7r3BMyNHAQY56KB81zFJ5Qxa74pB5YDTRS8Bro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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