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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85e5958374294d3debe75868d8e4f6bc542bd68069cbf19994cc1fdc3d06af4' 
  AND token = '+AhjtgIJIDKhfYVMwSLBJ+r1hfYyec68cf80i5MEuvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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