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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847d80ee10d364249666a14c36841f5acc72ea01d341362dec58cdc7a8689f90' 
  AND token = 'uG06OEJfjMntglmGcnx3rD/UlVx3KVHYC+tJ35TJXlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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