SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabc8775c6d5feab823f84c2261675e464e563a7248f2f1f3b05ba93aca931ff' 
  AND token = 'JVyGDsBzQNSqsTi7YLKf1CnEHhj9MrH4pN+CknpyFu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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