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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f859a190f19647707524f8f4a9b1bc3e07286c51cbacd56e20f1fba6f7bdb3' 
  AND token = '4Awh3AM5ffjItTSir0o3jxTfoD2X4JeuFB9IqXVt0OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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