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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2351a4e0c28e00ef5ffbc53d2d0d12258bcb0764c3bc3234fa4ff45d3732038c' 
  AND token = 'yFmMxnUI2ZS5v8vQ8ngufqk9KxE4movVadBpW1HlL2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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