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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b518dc9b8f100c143456805eb75213e0370187995bc863e067d50bd263a5e757' 
  AND token = 'AVoHxvOZ7Zr0mfH4Rq1HImwIDK6ADUhD0zUyNyRwfKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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