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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747662e602f3a66579a814cda51f9916dc2dffe8643e7e594d485b6a2e31d9b8' 
  AND token = 'vid8iJynQxwSKCA/yDp4rWamrglz4H20Xl/zFCRvW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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