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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64892a2deb7db934958afd032126213b38250e8198c37b5cb2fd7d10a5d6da25' 
  AND token = '3kJed5j8lb7nZ1gcZXan2E+/yu18ai6exXCfv4loaHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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