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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b77eb829526a4709d9a0931959d7acce53166692742c68989de11fee8a2ace' 
  AND token = 'NeXaVerVWQ/747gYKET49Ylxg4uef4qH764D3Rrx7jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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