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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73655fcd8ebc0acc7777d260e4bbd3d70586dcd6e0a154a47adfe33c96b98f4' 
  AND token = 'lQ7mfhhhl/mZvbBCZDagPBK7mqt4KCBxD/BgrqEBenY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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