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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf169085614e89c31fc08f23269beb6448b804c7b5e848b308a537bf3806f56' 
  AND token = 'dHZ02qNOcUftS+cUr5Gl6+vl9B7ZZtwo4dg9LuwWpc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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