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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ce85da7d2b11177875b7e5f710cf79e9b9e5210a588c6a546c54776f9ce8ae' 
  AND token = 'xqzGN/rONarO8ROJorLUSjF2yo9L4d0lNEX3oUFpb28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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