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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e8f71bf1e783184bfd16d741fe5e19298100e3e05d8029bf05aedd5686d82b' 
  AND token = 'GW5iKukP+IZGzGdEyFUSDawc/HsOdbzS1omhBBjBdHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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