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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf88538e57b731a6f9bc4cc3fab5b82b72e1c824857ee7f654f99b43d4415c5' 
  AND token = 'xyXuUqVBiT27pNxKPTKbnifK/70tsyEOOS+QVNuO0JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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