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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6db25543aa724c4b5f424984eb173672accd2269255237ec26bf8227667707' 
  AND token = 'HEt0azuZzaNQUx835QrIS8+bgtuB2vQ4In/CTk777LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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